High temp wireless thermal probe 5

[jones21]

Good day everyone,
I am working on a project that I need to monitor the temp on the end of a spinning shaft. My best thought is to have a wireless thermal probe, mounted on shaft. I have a indoor/outdoor temp type at home, but this will be seeing temps in the range of 400/500F. Has anyone ever used or have knowledge of this type of thermal probe???

Thank you in advance, Jones

 

[geekEE]

Rather than going wireless, can you just use an non-contact thermometer to measure the temperature?

 

[itsmoked]

That would be the typical modern method these days.

You would need to take care of the emissivity involved with a temp gun.



Otherwise it would likely be a tough design based considerably on the dynamic temperature profile expected.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[IRstuff]

500ºF is higher than any silicon IC-based devices can stand, or, at least, can stand for more than a few minutes. There are supposedly some silicon carbide based devices that can operate in that temperature regime, but I doubt that you'll find enough such devices to build a full-up wireless temp sensor.

TTFN

FAQ731-376

 

[MacGyverS2000]

Non-contact pyrometers are the way to go here...

Dan - Owner

http://www.Hi-TecDesigns.com

 

[Warpspeed]

I agree. A simple "gun" type non contact infrared reading pyranometer is the way to go. Perfect for measuring the temperature of fast moving parts such as bearings, pulleys, belts, clutches etc...

 

[jones21]

Thank you all for your replys. Your Experence is extremely valuable... It looks like your take is to go with the non contact. I will prusue this and it should be fairly low cost. I do not fully understand the statment "You would need to take care of the emissivity involved with a temp gun." I checked Wika and it is fairly complicated.
To narrow it down I will be using it to
monitor, temp on a polished A-2 tool steel block. Aprox 2" SQ X 1" thick. I do not know it that will help aid with clairifcation of "itsmoked" statment.
Thank you all and looking foward to hearing responses!
Jones

 

[geekEE]

You may need to make adjustments depending on the surface you are measuring and how accurate you need the measurements to be.

http://www.transcat.com/PDF/NonContactTemperature.pdf

 

[IRstuff]

Highly reflective and/or low emissivity surfaces generate IR emissions that contain reflections from the ambient, which tends to dilute the measurement. The ideal case, of course, is a perfectly dull black surface, with an emissivity of 1, which will only contain IR coming from the bulk temperature of the material behind that surface.

TTFN

FAQ731-376

 

[jones21]

OK thank you, that clears it up for me!!! I have put the wheels in motion to get one on order.

Thanks again, Jones

 

[itsmoked]

Yep geekEE, and IRstuff covered that well. Just make sure you can adjust it on your chosen solution. Either that or you have to have a way to 'de-shine' the target.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[Warpspeed]

Yup.

The infrared device is really measuring the visual color of an object in the deep infrared region.

For example, a human might judge the temperature of a very hot steel object as dull red, cherry red, bright red, white hot.

That works fine in a completely dark room, but what about looking at a white painted object out in the sunshine? The instrument might assume it was white hot.

As others have already said, beware of highly reflective or very brightly illuminated targets, it can confuse the instrument.